Electricity: measuring and testing – Particle precession resonance – Using a nuclear resonance spectrometer system
Patent
1985-08-16
1987-10-06
Tokar, Michael J.
Electricity: measuring and testing
Particle precession resonance
Using a nuclear resonance spectrometer system
324306, G01R 3320
Patent
active
046985921
ABSTRACT:
Inner-volume MRI techniques are extended to provide chemical shift NMR spectra for each voxel of an imaged inner-volume of a larger object. Spatial resolution is achieved within a selected inner-volume using multiple phase-encoded NMR measurement cycles with 90.degree. and 180.degree. RF nutation pulses being applied in the presence of inner-volume selective B.sub.o magnetic gradients. However, NMR spin echo RF responses are recorded during readout periods without application of any magnetic gradients. The resulting NMR data is then subjected to one dimension of Fourier Transformation to resolve conventional NMR chemical shift spectra while additional dimensions of Fourier Transformation are used to provide desired spation resolution within the inner-volume. Thus, for spectroscopic imaging, the signal readout period is used for chemical shift information while the tissue volume is spatially resolved with phase encoding on two or three spatial axes which have reduced fields of view using three orthogonal selective RF irradiations.
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The Regents of the University of California
Tokar Michael J.
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